A paper roll device and a speed control method for raw paper rewinding

Abstract

This application belongs to the field of papermaking technology, and particularly relates to a paper winding device and a method for controlling the speed of base paper rewinding. This application provides a paper winding device, including: a master roll winding assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly. The control assembly adjusts the rotation speed of the rewinding assembly based on the detection results of the paper defect detection assembly. This application also provides a method for controlling the speed of base paper rewinding. In the technical solution provided by this application, after the paper defect detection assembly detects paper defects in the base paper, it transmits the detection results to the control assembly. After analyzing the detection results, the control assembly issues a corresponding speed control command to the rewinding assembly. Compared with the method of manually checking for paper defects and then adjusting the rewinding speed, the paper defect detection assembly can effectively improve the accuracy and efficiency of paper defect detection. After analyzing the received paper defect information, the control assembly issues a rewinding speed adjustment command to the rewinding assembly, effectively preventing paper breakage during the rewinding process.

Description

Technical Field

[0001] This application belongs to the field of papermaking technology, and in particular relates to a paper rolling equipment and a method for controlling the speed of paper rewinding. Background Technology

[0002] The rewinder is a core piece of equipment in the final stage of roll material processing. Its function is to unwind, slit, trim, and rewind the original roll to produce finished rolls that meet user specifications, have neat ends, and uniform tension. Large paper mills use high-speed rewinders. During the operation of the rewinder, paper defects in the original paper can easily cause paper breaks, resulting in waste of original paper and loss of operating efficiency.

[0003] In existing technology, a designated person is responsible for checking the records of the paper defect detection system on the rewinder. This involves manually checking the raw paper for defects and their locations, manually slowing down the machine before reaching the defect location, and then resuming normal speed. This method relies heavily on manual labor and is subject to various limitations, such as varying personnel skills, large deviations in calculation results, and differing understandings. This can lead to inconsistencies in the slowdown points, or the machine being too busy with other tasks to check for defects, ultimately resulting in paper breakage in the rewinder.

[0004] Therefore, the development of a paper rewinding equipment and a speed control method for rewinding raw paper to solve the technical defects of poor inspection effect and low efficiency in the existing technology of relying on manual inspection of paper breakage faults in rewinding machines has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a speed control method for paper rewinding equipment and raw paper rewinding, which addresses the technical shortcomings of relying on manual inspection of paper breakage faults in existing technologies, which suffers from poor inspection results and low efficiency.

[0006] This application provides a paper rolling device, including: a master roll paper rolling assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly. The paper defect detection assembly, the master roll paper rolling assembly, and the rewinding assembly are arranged sequentially from front to back, and the paper defect detection assembly is disposed on the side of the master roll paper rolling assembly. The control component is electrically connected to the rewinding component and the paper defect detection component, respectively. The control component records and analyzes the paper defect detection results of the paper defect detection component to adjust the rotation speed of the rewinding component.

[0007] In one embodiment, the paper defect detection component is located 0.9-1.5 meters in front of the paper inlet of the master roll paper assembly.

[0008] In one embodiment, the paper defect detection component includes a detection unit, an illumination unit, and a support, wherein the detection unit and the illumination unit are mounted on the support, and the detection unit is electrically connected to the control component.

[0009] In one embodiment, the rewinding assembly further includes a horizontal adjustment section and a rewinding shaft, the horizontal adjustment section being electrically connected to the control assembly and connected to the rewinding shaft for adjusting the horizontal position of the rewinding shaft.

[0010] In one embodiment, the paper rewinding device further includes a master roll label assembly and a label recognition assembly. The master roll label assembly is disposed above the rewinding assembly, and the label recognition assembly is disposed at the front end of the rewinding assembly. The master roll label assembly and the label recognition assembly are electrically connected to the control assembly, respectively.

[0011] This application also provides a method for controlling the speed of paper rewinding, comprising: performing paper defect detection on the paper entering the rewinding inlet; if the detection result of the paper shows holes or tears, reducing the rewinding speed of the paper.

[0012] In one embodiment, the crack includes: an edge crack or a middle crack; If the test result includes the edge tear and the size of the edge tear is 10-20mm, the rewinding speed is reduced to below 1000 meters / minute; If the test result includes the edge tear and the size of the edge tear is greater than 20 mm, the rewinding speed is reduced to below 300 m / min; If the test result includes the intermediate crack and the size of the intermediate crack is less than 30 mm, the rewinding speed shall be reduced to below 1000 m / min; If the test result includes the intermediate tear and the size of the intermediate tear is greater than 30 mm, the rewinding speed shall be reduced to below 300 m / min; If the test result includes the hole and the size of the hole is within 20mm*20mm, the rewinding speed shall be reduced to below 1600 m / min; If the test result includes the hole and the size of the hole is greater than 20mm*20mm, the rewinding speed shall be reduced to below 800 meters / minute.

[0013] In one embodiment, the speed control method further includes: master roll identification, identifying the number of the master roll of raw paper, obtaining paper defect information of the master roll of raw paper, and adjusting the rewinding speed according to the paper defect information.

[0014] In one embodiment, if the detection result includes the edge tear and the length of the edge tear is less than 10 centimeters, the paper entering the rewinding inlet is subjected to a horizontal adjustment process, moving horizontally along the direction of the edge tear, wherein the displacement of the horizontal movement is greater than the length of the edge tear.

[0015] In one embodiment, the speed control method further includes: increasing the speed if the defective part of the original paper has passed 500 meters through the rewinding inlet, and increasing the rewinding speed to 1900 meters / minute or more.

[0016] In summary, this application provides a paper winding device, including: a master roll winding assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly. The control assembly is electrically connected to both the rewinding assembly and the paper defect detection assembly, and adjusts the rotational speed of the rewinding assembly. This application also provides a method for controlling the speed of raw paper rewinding. In the technical solution provided by this application, after the paper defect detection assembly detects paper defects in the raw paper, it transmits the detection results to the control assembly. After analyzing the detection results, the control assembly issues a corresponding speed control command to the rewinding assembly. Compared with the method of manually checking for paper defects and then adjusting the rewinding speed, the paper defect detection assembly can effectively improve the accuracy and efficiency of the detection results. After analyzing the received paper defect information, the control assembly issues a rewinding speed adjustment command to the rewinding assembly, effectively preventing paper breaks during the rewinding process. This solves the technical defects of the prior art, where relying on manual inspection of rewinding machine paper breakage faults results in poor inspection effectiveness and low efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a paper rolling device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of a paper defect detection component in a paper rolling device provided in an embodiment of this application; Figure 3 A schematic flowchart of a method for controlling the speed of paper rewinding in the technical solution provided in the embodiments of this application; Figure 4 Another flowchart illustrating a method for controlling the speed of paper rewinding in the technical solutions provided in this application embodiment; The components include a paper defect detection assembly 1, a support 11, a detection unit 12, an illumination unit 13, a master roll paper assembly 2, a rewinding assembly 3, a control assembly 4, a master roll label assembly 5, and a label recognition assembly 6. Detailed Implementation

[0019] This application provides a paper rewinding equipment and a speed control method for rewinding raw paper, which solves the technical defects of the prior art, which relies on manual inspection of paper breakage faults in rewinding machines, resulting in poor inspection effect and low efficiency.

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] To facilitate a better understanding of the technical solutions of the embodiments of this application, the following is a brief description of the paper rewinding process in the paper production process.

[0024] In modern continuous paper production processes, the formed base paper is sequentially wound into a large master roll and rewound and slit, forming a process from continuous web-shaped base paper to finished rolls. After processes such as wire forming, press dewatering, drying in the drying section, and calendering / sizing, the paper machine produces continuous web-shaped base paper. The base paper enters the master roll winding stage at a constant linear speed. In this stage, the high-speed web-shaped base paper is wound layer by layer evenly and tightly to form a large master roll with a single roll length of approximately 100,000 meters. The large master roll completely retains the width, flatness, and continuity of the base paper. It serves as a standard intermediate carrier connecting the front-end papermaking and the back-end rewinding process, transforming the base paper from a continuously running web-shaped form into a roll form that is easy to store, transport, and further process.

[0025] After the large master roll is wound up, it has a highly flexible process adaptability. It can directly enter the rewinding process according to the real-time operation status of the production line to achieve uninterrupted continuous processing; or it can be transferred to a designated storage area for temporary storage. Rewinding can be started at an opportune time according to the production schedule, order demand and the capacity matching of the preceding and following processes, so as to achieve flexible adjustment of the production rhythm and smooth transition between processes. The three links of base paper, large master roll and rewinding form a continuous, schedulable and matchable linkage system.

[0026] When entering the rewinding stage, the large master roll, as the sole raw material carrier, enters the working state, steadily and continuously releasing the rolled paper. The paper returns to a continuous, web-like running state, realizing the transformation of the paper from a large roll to a finished small roll. During the rewinding process, the paper establishes a stable running tension through the traction rollers, making it highly sensitive to the paper's internal quality. If the paper itself has defects such as tears or holes, under the combined action of rewinding tension, traction force, and cutter shearing force, the defective areas will quickly experience stress concentration, leading to paper breakage during rewinding. Paper breakage causes rewinding machine shutdown, increased waste, uneven roll ends, and more joints, significantly increasing energy consumption and material loss. The rewinding process, which could have been continuously and efficiently operated, is forced to stop due to paper defects, resulting in increased electricity consumption, gas consumption, and labor costs, and a decrease in overall energy efficiency.

[0027] In existing technology, a designated person is responsible for reviewing the records of the paper defect detection system on the rewinder. This involves manually checking the raw paper for defects and their locations, and then manually slowing down the rewinder before reaching the defect location. The rewinder then resumes its normal operating speed. However, high-speed rewinders operate at speeds of approximately 1900 meters per minute. If the manually reviewed defect information is incomplete or if the rewinder fails to slow down in time before the defect location, paper breakage may occur. Even if manual slowdown at the defect location prevents breakage, the manual operation itself remains inefficient.

[0028] Based on this, this application provides a paper winding device, including: a master roll paper winding assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly. The paper defect detection assembly, the master roll paper winding assembly, and the rewinding assembly are arranged sequentially from front to back, and the paper defect detection assembly is located on the side of the master roll paper winding assembly. The control assembly is electrically connected to the rewinding assembly and the paper defect detection assembly respectively. The control assembly records and analyzes the paper defect detection results of the paper defect detection assembly and is used to adjust the rotation speed of the rewinding assembly.

[0029] This application provides a paper winding equipment, including a fully integrated production system of raw paper-master roll-rewinding. Through a paper defect detection component to perform pre-detection of paper defects on the raw paper entering the master roll, the master roll winding component to take the master roll, and a control component to intelligently adjust the speed of the rewinding component, the automated and coordinated operation of the paper winding and rewinding processes is realized. This solves the technical defects of the prior art, which relies on manual inspection of paper breakage faults in rewinding machines, such as poor inspection effect, low efficiency, delayed response, and uncontrollable paper breakage risk, thereby improving the continuity of rewinding operations and production stability.

[0030] Specifically, the paper winding equipment provided in this application mainly includes a master roll winding assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly, with each assembly arranged sequentially from front to back along the direction of the raw paper's travel. The paper defect detection assembly, master roll winding assembly, and rewinding assembly are arranged in sequence, and the formed raw paper enters the master roll winding and rewinding process after completing paper defect detection. The paper defect detection assembly is located on the side of the master roll winding assembly, performing paper defect detection on the raw paper entering the master roll winding assembly without affecting its entry into the assembly. It also achieves full coverage of paper defect detection, ensuring no paper defect information is missed and improving the accuracy of the detection results. The control assembly is electrically connected to the rewinding assembly and the paper defect detection assembly, respectively. It can receive paper defect detection data in real time, complete information recording and intelligent analysis, and output control commands based on the analysis results to achieve precise adjustment of the rewinding assembly's rotation speed, constructing a closed-loop control logic of pre-detection, intelligent analysis, and predictive speed adjustment.

[0031] During the operation of the paper winding equipment, the continuous web-shaped base paper formed by the front-end papermaking process first enters the detection area of ​​the paper defect detection component. The paper defect detection component performs a full-area scan and defect identification of the base paper in a continuous online manner, accurately capturing paper defects such as tears, holes, thin areas, and black spots, and completing the quality status collection of the base paper. The paper defect detection component is set at the front end of the master roll winding assembly. While the base paper is wound into a large master roll with a length of approximately 100,000 meters, it realizes full-width and full-process paper defect detection of all the base paper in the large master roll. The paper defect information of the large master roll is collected in advance and tracked throughout the process, so that the paper defect data and the position of the base paper form a one-to-one correspondence, providing a data foundation for precise control in the subsequent rewinding stage.

[0032] The paper defect detection component synchronously transmits real-time detection results to the control component, which records, stores, classifies, and intelligently analyzes the received paper defect information. During the analysis, the control component filters paper defect types according to preset rules, automatically eliminating low-risk defects such as bright spots, black spots, and minor impurities that will not cause paper breakage. It only marks, locates, and tracks high-risk paper defects such as tears and openings that may cause stress concentration and tensile overload during the rewinding process. By intelligently distinguishing different paper defect characteristics in the base paper, the control component can accurately determine the travel position of high-risk base paper sections and make predictions based on the base paper running speed, the mother roll winding length, and the rewinding component's operating rhythm, achieving full-process dynamic tracking of high-risk paper defect sections.

[0033] When the section of raw paper marked with a high risk of paper defects is unwound from the main roll and approaches the rewinding assembly, the control component sends a deceleration command to the rewinding assembly before this section of raw paper reaches the rewinding area. The rewinding assembly reduces its operating speed accordingly, allowing the raw paper section at risk of paper breakage to pass through the rewinding area at a lower and smoother speed. This reduces the impact of tension fluctuations during rewinding on the defective area, preventing breakage and paper falling due to concentrated stress. After the high-risk raw paper section has completely passed the rewinding assembly, the control component sends a speed recovery command to the rewinding assembly, causing it to automatically return to its normal operating speed, maintaining efficient rewinding operations while ensuring safety.

[0034] Based on the description of the structure and working process of the paper winding equipment, the paper winding equipment provided in this application embodiment has the following advantages: First, by utilizing the technical feature of pre-positioning the paper defect detection component, defects in raw paper can be identified in advance and tracked throughout the entire process, replacing manual visual inspection and significantly improving the comprehensiveness and accuracy of paper defect identification. This addresses the root cause of the problems of poor manual inspection results and high missed detection rates.

[0035] Secondly, relying on the intelligent analysis and predictive speed adjustment technology of the control components, the rewinding speed can be automatically adjusted without manual shutdown, manual intervention, or manual adjustment, which significantly improves the efficiency of fault handling and process continuity, and solves the defects of low efficiency and slow response of manual troubleshooting.

[0036] Third, by combining the technical features of the master roll paper winding assembly and the rewinding assembly, a stable production link is formed throughout the entire process of raw paper-large master roll-rewinding. It can still maintain stable operation under long-distance, large-diameter, and high-speed production conditions, reduce the number of paper breakage shutdowns, and reduce paper loss and energy waste.

[0037] The technical solution provided in this application, through the coordinated operation of the paper defect detection component, control component, and rewinding component, replaces manual operation in an intelligent manner, achieving accurate identification of paper defects, early prediction of risks, and intelligent speed adjustment of rewinding, thereby comprehensively improving the stability, continuity, and automation level of the paper roll and rewinding process, and providing a reliable guarantee for continuous paper production.

[0038] To further optimize the technical solution, while ensuring the comprehensiveness and accuracy of the paper defect detection results for the raw paper, this application also considers the design concept of compact layout and small footprint of the paper winding equipment. In the technical solution provided in this embodiment, the paper defect detection component is located 0.9-1.5 meters in front of the paper inlet of the master roll paper winding assembly. Positioned 0.9-1.5 meters from the front of the paper inlet of the master roll paper winding assembly, the paper defect detection component is in the final straight running section before the raw paper enters the winding process of the master roll paper winding assembly. At this time, the raw paper is stable, without wrinkles or vibrations, ensuring that the paper defect detection component can achieve continuous, complete, and unobstructed full-area detection of paper defects such as tears and openings. This avoids reduced detection accuracy due to excessive distance causing the raw paper to deviate or vibrate, and also avoids limited detection field of view and insufficient data collection due to excessive distance, thus stably ensuring the comprehensiveness and accuracy of the paper defect detection results.

[0039] Meanwhile, the close-range installation method of 0.9-1.5 meters can integrate the paper defect detection component and the master roll paper winding component into a single unit, without occupying additional ground space. It eliminates the need for long-distance frames, transition guide rollers and other additional supporting structures, significantly shortens the longitudinal length of the whole machine, simplifies the equipment layout, effectively reduces the overall footprint of the paper winding equipment, and improves the space utilization rate of the workshop.

[0040] To further optimize the technical solution and improve the accuracy of paper defect detection results, achieving stable, clear, and interference-free acquisition of paper defects on the surface of raw paper, the technical solution provided in this application includes a paper defect detection component comprising a detection unit, an illumination unit, and a support. The detection unit and the illumination unit are mounted on the support, and the detection unit is electrically connected to the control component. In the various structures of the paper defect detection component, the support provides rigid fixation and height and angle positioning references for the detection unit and the illumination unit, ensuring a constant relative position between them and avoiding optical path deviation caused by vibrations during the operation of the paper winding equipment. The illumination unit provides uniform, flicker-free, and shadow-free backlighting or front lighting along the width direction of the raw paper, ensuring clear imaging conditions for defects such as cracks, openings, and thin areas on the surface of the raw paper, eliminating interference from paper surface reflections, ambient stray light, and uneven lighting on the detection signal. At this time, under stable illumination and rigid positioning support, the detection unit performs full-area, high-speed image acquisition of the raw paper, transmitting clear defect signals to the control component in real time for identification and analysis. The paper defect detection component significantly reduces the false detection rate and missed detection rate of paper defects in raw paper through the synergistic effect of illumination uniformity, structural stability and real-time signal transmission. It ensures accurate and reliable identification results for various paper defects that may cause paper breakage during rewinding, and provides real, complete and reliable data support for the control component to perform rewinding speed adjustment.

[0041] In practical applications, the detection unit can be a common high-speed camera or a high-definition video camera.

[0042] To further optimize the technical solution and enhance the adaptive avoidance capability of the rewinding process against paper defects, ensuring uninterrupted paper flow during rewinding from multiple dimensions, the paper winding device provided in this application embodiment includes a rewinding component further comprising: a horizontal adjustment unit and a rewinding shaft. The horizontal adjustment unit is electrically connected to the control component and to the rewinding shaft, and is used to adjust the horizontal position of the rewinding shaft. The horizontal adjustment unit, electrically connected to the control component, can receive displacement commands from the control component in real time. The horizontal adjustment unit, directly connected to the rewinding shaft, can drive the rewinding shaft to make slight left and right lateral adjustments along the horizontal direction, thereby changing the relative position of the main roll and the cutting edge on the rewinding shaft, achieving dynamic adjustment of the rewinding trimming width and the relative position of the cutting edge and paper defects. The horizontal adjustment unit further forms a closed-loop linkage with the paper defect detection component and the control component, adding a mechanical position avoidance structure on the basis of speed reduction control, improving the paper breakage avoidance capability in complex paper defect scenarios.

[0043] When the paper defect detection component determines that the raw paper has defects such as tears, holes, or breaks at the edges, and the current rewinding program is set to slit small-size paper rolls, small-size slitting is more sensitive to the condition of the raw paper edges. Even slight edge defects can cause uneven tension and paper breakage. At this time, the control component outputs a lateral displacement signal to the horizontal adjustment unit according to the parameter settings of the paper defect location and slitting width. The horizontal adjustment unit drives the rewinding shaft to make a small horizontal movement, compensating for the trimming amount on both sides of the raw paper during the rewinding process. This ensures that the paper defects at the edges of the raw paper are included in the trimming and removal area and are not subjected to force within the effective finished product width. Thus, without affecting the finished product specifications, the stress concentration points of the paper defects are avoided, ensuring the continuous and stable slitting process.

[0044] Furthermore, in the extreme case where a cutting edge of the rewinding assembly coincides with the location of a paper defect during the rewinding process, even if the control assembly reduces the speed of the rewinding assembly, the combined shearing force of the cutting edge and the paper defect can easily cause a direct paper breakage. In this situation, the control assembly, based on the real-time matching result of the paper defect coordinates and the cutting edge position, drives the horizontal adjustment unit to move the rewinding shaft and the main roll laterally, changing the trimming width distribution on both sides. This allows the cutting edge and the paper defect location to be misaligned and avoided in the width direction, physically severing the overlapping force relationship between the cutting edge and the paper defect.

[0045] By coordinating the horizontal adjustment unit with the rewinding shaft, precise avoidance of paper defects can be achieved without stopping the machine or excessively reducing speed, eliminating the risk of paper breakage caused by the combined effects of blade shearing and paper defects. Compared to a single protection method relying solely on speed reduction, the addition of horizontal position adjustment can handle more complex types of paper defects, making it particularly suitable for demanding conditions such as small-size slitting, high-hardness paper, and high-speed rewinding. This improves equipment operational stability and paper yield, with passive speed reduction and active avoidance working in tandem to solve paper breakage problems during the rewinding process.

[0046] To further optimize the technical solution and achieve accurate traceability and early prediction of paper defect information in scenarios involving large master roll temporary storage and scheduled rewinding, the paper rolling device provided in this application embodiment also includes: a master roll label component and a label recognition component. The master roll label component is disposed above the rewinding component, and the label recognition component is disposed at the front end of the rewinding component. The master roll label component and the label recognition component are electrically connected to the control component. The master roll label component is disposed above the rewinding component, and the label recognition component is disposed at the front end of the rewinding component. Both are electrically connected to the control component, forming a closed-loop information system for the entire paper rolling process, encompassing paper defect detection, information binding, label writing, offline storage, barcode scanning and recognition, and intelligent control.

[0047] When the main roll is wound and not immediately rewound but needs to be temporarily stored according to the production schedule, the control component binds the paper defect data, such as tears, holes, high-risk section locations, lengths, and distributions, detected throughout the entire process of the base paper roll, to the main roll one by one. The main roll labeling component then generates and affixes a unique electronic tag to the outside of the main roll. The tag stores complete information about the corresponding paper defects, achieving precise association of one code and one file per roll.

[0048] When the large master roll is re-entered for rewinding, the label recognition component located at the front end of the rewinding assembly can read the paper defect data in the label during the initial unwinding stage and upload it to the control component in real time. The control component performs precise timing calculations based on the pre-stored paper defect location, running speed, and unwinding length, and outputs deceleration, trimming adjustment, or horizontal avoidance commands in advance before high-risk paper defect sections reach the rewinding blade and traction position.

[0049] By setting up the master roll label component and label recognition component, the problem of not being able to trace paper defects and only being able to passively deal with paper breaks after the master roll is temporarily stored and rewound is solved. There is no need to repeat the detection during rewinding, which greatly improves the information utilization rate and response speed. The temporary master roll can also achieve intelligent prediction and protection. There is no need for manual input and verification of paper defect information throughout the process, avoiding human error and improving the stability and production efficiency of rewinding.

[0050] Please see here. Figure 3 This application also provides a speed control method for rewinding raw paper, including: S1, performing paper defect detection on the raw paper entering the rewinding inlet; if the detection result of the raw paper shows holes or tears, reducing the rewinding speed of the raw paper. The speed control method provided in this application is adapted to the full-process linkage control logic of the aforementioned paper winding equipment. With front-end paper defect identification, precise segment tracking, and proactive speed reduction as the core, it achieves real-time matching between rewinding speed and raw paper quality status, avoiding paper breakage caused by paper defects such as holes and tears at the control logic level, and comprehensively improving the continuity and stability of rewinding operations.

[0051] Specifically, this includes: performing full-area detection on continuously running raw paper before it enters the rewinding process, and collecting paper defect information in real time; when the detection results determine that the raw paper has high-risk paper defects such as holes and tears that are prone to stress concentration and tensile overload, the defective section of the raw paper is immediately located, marked and tracked, and the rewinding speed is reduced before the defective position reaches the critical stress position of rewinding, so that the high-risk raw paper passes through the rewinding area in a stable state with low tension and low impact.

[0052] In the specific execution process, the paper defect information of the raw paper is obtained by scanning the entire surface of the raw paper, such as the location, size, and distribution of holes and tears. Based on the obtained paper defect information and its specific location, a traceable position coordinate is formed. When the raw paper section corresponding to the coordinate approaches the rewinding entrance for rewinding, the travel time and speed matching relationship of the paper defect part are calculated in advance, and a deceleration command is actively output. Unlike the traditional passive shutdown or post-processing mode, the speed control method provided in this application replaces post-remediation with pre-judgment, reducing the probability of paper breakage from the source of speed control.

[0053] When the base paper has defects such as holes or tears, the traction force, slitting shear force, and roller friction during the rewinding process easily create stress concentration at the defect location, directly leading to paper tearing, breakage, and paper loss. The speed control method provided in this application, by implementing a speed reduction process, can effectively reduce the linear speed of the base paper and the rate of change of force per unit time, reduce the amplitude of rewinding tension fluctuations, and make the tension system more smoothly adapt to the weak areas of the paper defect location, avoiding instantaneous tension tearing of the base paper under high-speed operation.

[0054] The rewinding speed control method provided in this application is based on the paper defect detection results of the base paper. It actively reduces the speed of the rewinding process according to the paper defect detection results, which can specifically solve the risk of paper breakage caused by paper defects such as holes and tears. The entire process does not require manual judgment or intervention, improves the timeliness and accuracy of rewinding speed adjustment, reduces the number of downtimes, reduces paper waste, and improves rewinding efficiency and finished product qualification rate. It provides reliable method support for high-speed, continuous and stable rewinding production by intelligently controlling the rewinding speed according to the actual quality status of the base paper.

[0055] To further optimize the technical solution, while effectively reducing the risk of paper breakage during rewinding, the technical solution provided in this application embodiment also takes into account the maximization of rewinding production efficiency. Differentiated and refined rewinding speed graded control is performed according to the type, location and size of paper defects to achieve precise control of rewinding speed and avoid efficiency loss caused by indiscriminate speed reduction.

[0056] In the technical solution provided in this application, tears are divided into two categories: edge tears and center tears, and corresponding speed limits are applied based on the size range. If the detection result includes an edge tear with a size of 10-20mm, the rewinding speed is reduced to below 1000m / min while maintaining high operating efficiency, ensuring that the edge defect is not torn. If the detection result includes an edge tear with a size greater than 20mm, the rewinding speed is reduced to below 300m / min. At this time, the paper passes through the rewinding area at a very low speed, significantly reducing edge tension and stress concentration. If the detection result includes a center tear with a size less than 30mm, the rewinding speed is reduced to below 1000m / min to adapt to the stress characteristics of defects in the middle of the paper surface. If the detection result includes a center tear with a size greater than 30mm, the rewinding speed is reduced to below 300m / min to prevent large-area center defects from rapidly expanding and breaking under tension.

[0057] For defects such as holes, if the test results include holes and the size of the holes is within 20mm*20mm, since small holes have a limited impact on the overall strength of the base paper, there is no need to reduce the speed excessively, and the rewinding speed should be reduced to below 1600 meters / minute; if the test results include holes and the size of the holes is greater than 20mm*20mm, in order to balance the structural safety of the base paper and the production continuity of the rewinding operation, the rewinding speed should be reduced to below 800 meters / minute.

[0058] In the technical solution provided in this application embodiment, the graded speed adjustment strategy formulated according to the type and size of paper defects can accurately match the stress risk level of different paper defects in the base paper. It can implement strong protective speed reduction for high-risk defects and retain an efficient operating range for low-risk defects, achieving the optimal balance between paper breakage prevention and production efficiency, and significantly improving the overall economy and stability of the rewinding process.

[0059] In practical applications, it may be possible for multiple types of defects to exist simultaneously in the same location of the raw paper. When implementing a speed reduction process, the minimum rewinding speed should be used, or an alarm signal should be issued to stop the machine. Operators can perform various operations depending on the specific production situation.

[0060] Please see here. Figure 4To further optimize the technical solution and achieve rapid retrieval of paper defect information and accurate speed prediction during the rewinding operation of the large master roll, the speed control method provided in this application embodiment further includes: S101, master roll identification, identifying the number of the original master roll, obtaining the paper defect information of the original master roll, and adjusting the rewinding speed according to the paper defect information. Before the large master roll is rewound, its number is identified, and the corresponding paper defect information is obtained based on the large master roll number. This eliminates the need for re-inspection before rewinding, allowing direct establishment of the corresponding control relationship between the paper defect location and the rewinding speed. Based on the pre-stored paper defect type and size parameters, the rewinding speed is set and adjusted according to the preset grading information. Before the rewinding operation is performed at the paper defect location, actions such as speed reduction and speed stabilization are performed in advance to achieve pre-judgment of speed control.

[0061] By implementing a master roll identification process, the problems of lost paper defect information and inability to predict defects in advance can be solved when large master rolls are temporarily stored, rewound across batches, or rewound across schedules. This avoids the equipment investment and time loss caused by repeated testing, and also avoids the risks of errors and omissions caused by manual entry of paper defect information. By linking master roll identification with historical paper defect data, rewinding speed can be adjusted more promptly and accurately, ensuring that the rewinding process maintains the optimal operating speed that matches the quality of the original paper while ensuring no paper breaks.

[0062] It should be noted here that after completing S101, all paper defect information of the original paper roll to be rewound has been obtained. At this point, to avoid redundancy, step S1 is not required.

[0063] To further optimize the technical solution, a dual anti-paper-breakage mechanism combining speed control and position avoidance is constructed. In the technical solution provided in this application embodiment, if the detection result includes an edge tear and the length of the edge tear is less than 10 cm, the raw paper entering the rewinding inlet is subjected to horizontal adjustment, moving horizontally along the direction of the edge tear, with the horizontal displacement greater than the length of the edge tear. The horizontal adjustment action is synchronized with the rewinding operation rhythm, and without stopping the machine or significantly reducing the speed, the edge tear is directly moved to the trimming and cutting range, preventing the tear from extending and tearing under the action of rewinding tension and shearing force. The horizontal movement displacement before cutting is greater than the tear length, which can ensure that the tear does not come into contact with critical stress positions throughout the process, eliminating the risk of stress concentration from the physical path. At the same time, horizontal avoidance is adopted for small edge tears less than 10 cm, without excessive speed reduction, ensuring rewinding safety while maximizing production efficiency and avoiding capacity loss caused by indiscriminate speed reduction.

[0064] By actively avoiding small tears in the base paper by moving it horizontally, and in conjunction with graded speed reduction, the stability of rewinding can be further improved, the paper breakage rate and paper waste can be reduced, and the overall rewinding quality and continuous operation capability can be improved.

[0065] To further optimize the technical solution and ensure a rapid return to efficient rewinding production after paper defect avoidance, the speed control method provided in this application embodiment further includes: speed increase. If the defective part of the raw paper has passed 500 meters past the rewinding inlet, the rewinding speed is increased to over 1900 meters per minute. By executing the speed increase step, it can be ensured that the raw paper continues to complete the subsequent normal rewinding operation at high speed, achieving a complete closed-loop control of deceleration-avoidance-speed increase. In the raw paper rewinding operation procedure, the 500-meter safety distance ensures that the defective part has completely moved away from all critical stress areas such as the rewinding blade, traction roller, and pressure roller, eliminating the risk of paper defects causing breakage again and ensuring a stable and impact-free speed increase process. Timely speed increase after confirming that the paper defect has completely moved away from the danger zone can offset the production capacity loss caused by the deceleration due to paper defects to the greatest extent, allowing the rewinding equipment to quickly return to the efficient operating range while ensuring safety.

[0066] The speed-up steps here can be adapted to Figure 3 The S2 step can also be adapted. Figure 4 Step S102.

[0067] Compared to continuous low-speed operation without differentiation, this speed-up step can significantly increase the rewinding length per unit time, improve rewinding efficiency, and avoid quality problems such as paper wrinkling, uneven tension, and uneven end faces caused by long-term low-speed operation. Through intelligent switching between dangerous speed reduction and safe speed increase, the dual goals of controllable paper breakage risk and maximized production efficiency are effectively achieved, improving the economic efficiency and stability of the production line.

[0068] In summary, this application provides a paper winding device, including: a master roll winding assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly. The control assembly is electrically connected to both the rewinding assembly and the paper defect detection assembly, and adjusts the rotational speed of the rewinding assembly. This application also provides a method for controlling the speed of raw paper rewinding. In the technical solution provided by this application, after the paper defect detection assembly detects paper defects in the raw paper, it transmits the detection results to the control assembly. After analyzing the detection results, the control assembly issues a corresponding speed control command to the rewinding assembly. Compared with the method of manually checking for paper defects and then adjusting the rewinding speed, the paper defect detection assembly can effectively improve the accuracy and efficiency of the detection results. After analyzing the received paper defect information, the control assembly issues a rewinding speed adjustment command to the rewinding assembly, effectively preventing paper breaks during the rewinding process. This solves the technical defects of the prior art, where relying on manual inspection of rewinding machine paper breakage faults results in poor inspection effectiveness and low efficiency.

[0069] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Furthermore, other implementation methods can be derived from the above embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A paper winding apparatus characterized by comprising: The paper winding equipment includes: a master roll paper winding assembly, a rewinding assembly, a control assembly, and a paper defect detection assembly. The paper defect detection assembly, the master roll paper winding assembly, and the rewinding assembly are arranged sequentially from front to back, and the paper defect detection assembly is located on the side of the master roll paper winding assembly. The control component is electrically connected to the rewinding component and the paper defect detection component, respectively. The control component records and analyzes the paper defect detection results of the paper defect detection component to adjust the rotation speed of the rewinding component.

2. The paper winding equipment according to claim 1, characterized in that, The paper defect detection component is located 0.9-1.5 meters in front of the paper inlet of the master roll paper assembly.

3. The paper winding equipment according to claim 1 or 2, characterized in that, The paper defect detection component includes a detection unit, an illumination unit, and a support. The detection unit and the illumination unit are mounted on the support, and the detection unit is electrically connected to the control component.

4. The paper winding equipment according to claim 1 or 2, characterized in that, The rewinding assembly further includes a horizontal adjustment section and a rewinding shaft. The horizontal adjustment section is electrically connected to the control assembly and is connected to the rewinding shaft for adjusting the horizontal position of the rewinding shaft.

5. The paper winding equipment according to claim 1 or 2, characterized in that, The paper rolling equipment further includes a master roll label assembly and a label recognition assembly. The master roll label assembly is disposed above the rewinding assembly, and the label recognition assembly is disposed at the front end of the rewinding assembly. The master roll label assembly and the label recognition assembly are electrically connected to the control assembly, respectively.

6. A method for controlling the speed of paper rewinding, characterized in that, The speed control method includes: performing paper defect detection on the raw paper entering the rewinding inlet; if the detection result of the raw paper shows holes or tears, the rewinding speed of the raw paper is reduced.

7. The speed control method according to claim 6, characterized in that, The crack includes: an edge crack or a middle crack; If the test result includes the edge tear and the size of the edge tear is 10-20mm, the rewinding speed is reduced to below 1000 meters / minute; If the test result includes the edge tear and the size of the edge tear is greater than 20 mm, the rewinding speed is reduced to below 300 m / min; If the test result includes the intermediate crack and the size of the intermediate crack is less than 30 mm, the rewinding speed shall be reduced to below 1000 m / min; If the test result includes the intermediate tear and the size of the intermediate tear is greater than 30 mm, the rewinding speed shall be reduced to below 300 m / min; If the test result includes the hole and the size of the hole is within 20mm*20mm, the rewinding speed shall be reduced to below 1600 m / min; If the test result includes the hole and the size of the hole is greater than 20mm*20mm, the rewinding speed shall be reduced to below 800 meters / minute.

8. The speed control method according to claim 6 or 7, characterized in that, The speed control method further includes: master roll identification, identifying the number of the master roll of raw paper, obtaining paper defect information of the master roll of raw paper, and adjusting the rewinding speed according to the paper defect information.

9. The speed control method according to claim 7, characterized in that, If the detection result includes the edge tear and the length of the edge tear is less than 10 cm, the paper entering the rewinding inlet is subjected to horizontal adjustment, moving horizontally along the direction of the edge tear, and the displacement of the horizontal movement is greater than the length of the edge tear.

10. The speed control method according to claim 6, characterized in that, The speed control method further includes: speed increase; if the defective part of the original paper has passed the rewinding inlet for 500 meters, the rewinding speed is increased to more than 1900 meters / minute.

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